//test_demo.c
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
void showbuf(char *buf);
int MAX_LEN=32;
int main()
{
int fd;
int i;
char buf[255];
for(i=0;i<MAX_LEN;i++)
{buf[i]=i;}
fd=open("/dev/evadevfs/0",O_RDWR);
if(fd<0)
{
printf("######devfs drivers open failed!!######\n");
return(-1);
}
printf("######devfs drivers open success!!######\n");
printf("write %d bytes data to /dev/evadevfs \n",MAX_LEN);
showbuf(buf);
write(fd,buf,MAX_LEN);
printf("Read %d bytes data from /dev/evadevfs \n",MAX_LEN);
read(fd,buf,MAX_LEN);
showbuf(buf);
ioctl(fd,1,NULL);
close(fd);
return 0;
}
void showbuf(char *buf)
{
int i,j=0;
for(i=0;i<MAX_LEN;i++)
{
if(i%4==0) printf("\n%4d:",j++);
printf("%4d",buf[i]);
}
printf("\n*********************************\n");
}

